| 5412263 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 266 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 52 / 280 |
Estimated T-Level: 20.9 ⓘ TF below 2^65 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1998-08-24 | Takahiro Shakushi | EAF37264ED3C543A | 0 | Windows,Prime95,v16,NT service,(aka WS5) | | Factored | 2001-10-25 | David Strachan | EAF37264ED3C543A | 2330276 | Windows,Prime95,v21,(aka WX1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-03-17 | Stefan G Hoffmann | 8C0071685902DC6F | 1 | 1946124 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-03-17 | George Woltman | CERT | Proof certified good | | 2025-03-17 | Stefan G Hoffmann | C-PRP | Proof Certified Good
Proof Power: 7
| | 2025-03-12 | Andrey Dobrynin | F-ECM | Factor: 1472549432113610227984457 / ECM curve 24, B1=50000, B2=45039225, Edwards Sigma=944732802780897 | | 2022-08-04 | Sid & Andy | NF-PM1 | B1=5000000, B2=7303965900 | | 2021-09-18 | SRBase | NF | no factor TF: 71-72 | | 2021-09-06 | SRBase | NF | no factor TF: 70-71 | | 2021-08-21 | SRBase | NF | no factor TF: 69-70 | | 2021-06-12 | Dylan Delgado | NF-PM1 | B1=2170000, B2=175770000 | | 2020-09-21 | TJAOI | NF | no factor TF: 68-69 | | 2019-07-27 | GdS | NF-PM1 | B1=1807207, B2=48794593 | | 2018-06-29 | ramgeis | NF | no factor TF: 67-68 | | 2016-06-18 | Gordon Spence | NF | no factor TF: 66-67 | | 2015-08-21 | snme2pm1 | NF | no factor TF: 65-66 | | 2014-12-30 | monst | NF | no factor TF: 64-65 | | 2014-12-29 | Nesowa | NF | no factor TF: 63-64 | | 2010-10-19 | Squeeky_Squirrel | NF-PM1 | B1=60000, B2=960000, E=6 | | 2009-02-21 | abc | NF | no factor TF: 1-63 | | 2001-10-25 | Bumblebee | C-LL | EAF37264ED3C543A | | 2001-04-29 | Bumblebee | NF-PM1 | B1=20000, B2=140000 | | 2000-10-07 | -anonymous- | NF-PM1 | B1=25000, B2=212500 | | 1998-08-24 | -anonymous- | C-LL | EAF37264ED3C543A | | 1998-03-17 | -anonymous- | NF | no factor TF: 1-62 |
|
